Flexible Conduits Provide Both EMI And RFI Shielding April 2001 Issue Published Date: April 01, 2001
Three flexible electrical conduits now offer EMI and RFI shielding. These liquid-tight conduits give users the ability to employ traditional wiring solutions in shielding applications, providing an alternative to costly, specialized shielded cable assemblies. The conduits are designed to protect sensitive electronic circuits in applications such as communications, radar and data. Shielding effectiveness ranges from 126 dB at 1 MHz to 120 dB at 1 GHz. Type EMS has a temperature rating of -55°C to 105°C and features a flexible core constructed of a helically wound interlocked strip of bronze. An all-temperature PVC jacket is extruded over the core, resulting in a sealed, waterproof raceway when assembled with liquid-tight fittings. Type EMSP is adds a tinned copper shielding braid under the flexible jacket and Type LAS is a UL 369-listed version. Type LAS has a galvanized steel core, over which a tinned copper shielding braid is applied and the outer jacket is flexible PVC with a temperature rating of -20°C to 60°C.
